Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d69d3b91f9fb267…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 12:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06cbb207ebd50070f1e7e3329d2a2676 SHA-1: 2c04d02b926624f53cf1da0aab6ec40e19a5da6c SHA-256: 3d69d3b91f9fb2674a9e67ff0c24efa194781e991ead10a3a9508f9f171aa784
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hayatteknoloji.com/webimage/file/54015469793.pdf In PDF document text
    • http://mirai-kankyo.com/userfiles/files/rujojipifaroxab.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa590be7a4c---49525526388.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/kixedubeloxirufuxoxelajo.pdfIn PDF document text
    • https://ecoretras.com/file/juluvarugibilurowosivu.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/29069042161.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/3593ce8e8bc5b3fa407a6c80de18faf8/53875124913.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/27307913710.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109011803263306.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608797c51531b---jepiweb.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/83422099063.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ac1f2e4a52---18354004501.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ab38868ec---veremipovagoxobov.pdfIn PDF document text
    • http://dd-eng.com/files/files/zofidi.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/71437583823.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/fubokoremesenotumek.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087aec4976fe---40675072532.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0880be0ea---41507356651.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/35996084615.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/naxojupud.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8523d639e4---54748278750.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/tojemukituxowef.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e612691dd8---18685867451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=maltese+language+book+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 19772 bytes
SHA-256: 0ac5b66d0fe4c7c26021d42542d18a7ec9e8d6f1048ef242ae2e732e5d79b6db
font_01_sfnt_off00010e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 10804 bytes
SHA-256: af634cf1eaab5be8db0531d387d00a311b3ff7e1cabca637fec27829e4d74e8a
font_02_sfnt_off000126f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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